cant see MPLS ldb label traceroute from SP1 to SP3

[Rock007]

Hi guys,

really appreciate if any one help me on this

i am currently building a lab for the MPLS vpn, using three Cisco XR as part of a service provider network.

i have used ospf for inside the service provider and have enabled the mpls on the ports as well as globally (mpls oam).

I am unable to see the MPLS labels while using traceroute from SP1 to SP3 port, although normal ping/traceroute is working.

I also noticed something unusually that   on SP2 when i look MPLS forwarding i cant see the network 10.10.0.0 and 10.9.0.0 and the relevant labels... is it something i am missing.

SP1=SP2=SP3=XRV613 imag

 i have uploaded the images at the below link for the topology and mpls forwarding table and the traceroute.

https://postimg.cc/NyV5W3LH

https://postimg.cc/2LCBCPN8

Traceroute from SP1
Type escape sequence to abort.
Tracing the route to 10.9.0.1

1 10.10.0.2 19 msec 0 msec 0 msec
2 10.9.0.1 0 msec * 0 msec
RP/0/0/CPU0:ios#

[Harold Ritter · Accepted solution]

SP1 uses the implicit null label to reach all destinations directly connected to SP2. You traceroute to 10.9.0.1, which is a subnet directly connected to SP2, hence no label being shown. Try 3.3.3.3 instead.

Regards,

[Rock007]

Thanks Harold, it now make sense.
i was also trying to implement L3VPN, and for that i was trying to configure the RD and the RT values, but i think the XR options are totally change then the normal IOS.
i came to know that we can only define the VRF and RD under the bgp, but for the route-target we have to further go insde BGP>VRF.Address family#RT....
i have two queries ....
1- as per my understanding Route-target-RT is the extended community but why we are using under the address-family?
2- i cant find the way to set the RT value as it is not accepting any values only giving the option for the download... how can i set the RT value here.

really appreciate the help regarding this.

out put...............
Cisco IOS XR Software, Version 6.1.3[Default]

RP/0/0/CPU0:ios#conf t
Tue Oct 1 19:48:43.526 UTC
RP/0/0/CPU0:ios(config)#router bgp 100
RP/0/0/CPU0:ios(config-bgp)#vrf Test1
RP/0/0/CPU0:ios(config-bgp-vrf)#RD 100:1
RP/0/0/CPU0:ios(config-bgp-vrf)#address-family
% Incomplete command.
RP/0/0/CPU0:ios(config-bgp-vrf)#address-family ipv4 uni
RP/0/0/CPU0:ios(config-bgp-vrf-af)#route-target ?
download Install route-targets in RIB
RP/0/0/CPU0:ios(config-bgp-vrf-af)#route-target 100:1
^
% Invalid input detected at '^' marker.
RP/0/0/CPU0:ios(config-bgp-vrf-af)#route-target ?
download Install route-targets in RIB
RP/0/0/CPU0:ios(config-bgp-vrf-af)#route-target

[Harold Ritter]

> 1- as per my understanding Route-target-RT is the extended community but why we are using under the address-family?

The reason you need to configure the address-family is first to enable the address family (either ipv4, ipv6 or both) and second to allow for different route-target for each address family, if you wish to do so. You would normally use the same route-target for both ipv4 or ipv6 though.

> 2- i cant find the way to set the RT value as it is not accepting any values only giving the option for the download... how can > i set the RT value here.

The "route-target download" is another feature. For the route-target required for L3VPN, you need to configure it in the following way:

vrf Test1
address-family ipv4 unicast
import route-target
100:1
!
export route-target
100:1
!
!
!

Regards,